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cflynn_29's avatar
cflynn_29
Icon for Helper I rankHelper I
4 years ago
Solved

Power Query | COALESCE Table and Replace all first row values in Table

I have a Table and all of the first row has values that i would like to promote but Column "Data.Column7" has a bunch of nulls before the first value and with the data structure the way it is i would...
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  • v-yanjiang-msft's avatar
    v-yanjiang-msft
    4 years ago

    Hi cflynn_29 ,

    According to your description, here's my solution.

    1.Add an index column.

    2.Add a custom column.

    Custom = if[Index]=0 then List.First(List.RemoveItems(#"Added Index"[Column3],{""})) else [Column3]

    Then the title reaches the first row.

    Remove Index and Column3, get the expected result.

    Here's the code.

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCsksyUlV0oHTSrE60UogGso0BDJMYRwjIMMMrhgkYgzkmcOkTYAMCyC2VIqNBQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if[Index]=0 then List.First(List.RemoveItems(#"Added Index"[Column3],{""})) else [Column3]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Column3", "Index"})
in
    #"Removed Columns"

    I attach my sample below for reference.

     

    Best Regards,
    Community Support Team _ kalyj

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

AlexisOlson's avatar
AlexisOlson
Icon for Super User rankSuper User
4 years ago

Instead of promoting headers, you could instead just rename the columns directly.

 

Try this:

let
    Source = Table.FromRows({{"Title1","Title2",null}, {1,2,null}, {3,4,"Title3"}, {"Title", "Title", null}}),
    FirstNonNulls = List.Transform(
        Table.ColumnNames(Source),
        each List.First(List.RemoveNulls(Table.Column(Source, _)))
    ),
    RenameCols = Table.RenameColumns(Source, List.Zip({Table.ColumnNames(Source), FirstNonNulls}))
in
    RenameCols
cflynn_29's avatar
cflynn_29
Icon for Helper I rankHelper I
4 years ago

I am using those "Titles" that are promoted as a filtering mechanism, if the Column Names dont have "Title" in it they get filtered. That way when data is added it becomes automatic. The reason the Column 7 has information so far down just the nature of how the data is being entered. 

 

But if can get that First non-null value you in each column and move it to the first row in the same column then its all good

  • AlexisOlson's avatar
    AlexisOlson
    Icon for Super User rankSuper User
    4 years ago

    Sorry, I don't understand why what I suggested doesn't work with your "filtering mechanism".